Transit visa to UK

[haritha.bh]

Hello 

 

Im planning to visit India via London Heathrow airport. I have few questions whether i need to have a DATV visa or not.

1. I have a F2 visa stamp till 2019.

2. But now i have a valid H4(I-797) which needs to get stamped.

 

In my case, do I need to get a DATV visa to travel via London or should the F2 visa on my passport is enough.

 

I would appreciate your reply to this topic.

 

Thanks in advance

Haritha